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/* connect.c - Open connection to server.
*
* Copyright (C) 2010, Pawel Krawczyk <kravietz@ceti.pl> and
* Jeroen Nijhof <jeroen@nijhofnet.nl>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program - see the file COPYING.
*
* See `CHANGES' file for revision history.
*/
#include <signal.h>
#include <arpa/inet.h>
#include <time.h>
#include <fcntl.h>
#include <errno.h>
#ifdef _AIX
#include <sys/socket.h>
#endif
#include "tacplus.h"
#include "libtac.h"
/* Pointer to TACACS+ connection timeout */
int tac_timeout = 5;
/* Returns file descriptor of open connection
to the first available server from list passed
in server table.
*/
int tac_connect(struct addrinfo **server, int servers) {
int tries = 0;
int fd, flags, retval;
fd_set readfds, writefds;
struct timeval tv;
if(!servers) {
syslog(LOG_ERR, "%s: no TACACS+ servers defined", __FUNCTION__);
return(-1);
}
while(tries < servers) {
if((fd=socket(server[tries]->ai_family, server[tries]->ai_socktype, server[tries]->ai_protocol)) == -1) {
syslog(LOG_WARNING,
"%s: socket creation error", __FUNCTION__);
tries++;
continue;
}
/* put socket in non blocking mode for timeout support */
flags = fcntl(fd, F_GETFL, 0);
if(fcntl(fd, F_SETFL, flags | O_NONBLOCK)) {
syslog(LOG_WARNING, "%s: cannot set socket non blocking",
__FUNCTION__);
tries++;
continue;
}
retval = connect(fd, server[tries]->ai_addr, server[tries]->ai_addrlen);
if((retval == -1) && (errno != EINPROGRESS)) {
syslog(LOG_WARNING,
"%s: connection to %s failed: %m", __FUNCTION__,
tac_ntop(server[tries]->ai_addr, server[tries]->ai_addrlen));
if(fcntl(fd, F_SETFL, flags)) {
syslog(LOG_WARNING, "%s: cannot restore socket flags",
__FUNCTION__);
}
tries++;
continue;
}
/* set fds for select */
FD_ZERO(&readfds);
FD_SET(fd, &readfds);
writefds = readfds;
/* set timeout seconds */
tv.tv_sec = tac_timeout;
tv.tv_usec = 0;
/* check if socket is ready for read or write */
if(!select(fd+1, &readfds, &writefds, NULL, &tv)) {
syslog(LOG_WARNING,
"%s: connection timeout with %s : %m", __FUNCTION__,
tac_ntop(server[tries]->ai_addr, server[tries]->ai_addrlen));
if(fcntl(fd, F_SETFL, flags)) {
syslog(LOG_WARNING, "%s: cannot restore socket flags",
__FUNCTION__);
}
tries++;
continue;
}
/* connected ok */
if(fcntl(fd, F_SETFL, flags)) {
syslog(LOG_WARNING, "%s: cannot restore socket flags",
__FUNCTION__);
}
TACDEBUG((LOG_DEBUG, "%s: connected to %s", __FUNCTION__, \
tac_ntop(server[tries]->ai_addr, server[tries]->ai_addrlen)));
return(fd);
}
/* all attempts failed */
syslog(LOG_ERR, "%s: all possible TACACS+ servers failed", __FUNCTION__);
return(-1);
} /* tac_connect */
int tac_connect_single(struct addrinfo *server) {
struct addrinfo *temp[1];
temp[0] = server;
return(tac_connect(temp, 1));
} /* tac_connect_single */
char *tac_ntop(const struct sockaddr *sa, size_t ai_addrlen) {
char *str = (char *) xcalloc(1, ai_addrlen);
switch(sa->sa_family) {
case AF_INET:
inet_ntop(AF_INET, &(((struct sockaddr_in *)sa)->sin_addr),
str, ai_addrlen);
break;
case AF_INET6:
inet_ntop(AF_INET6, &(((struct sockaddr_in6 *)sa)->sin6_addr),
str, ai_addrlen);
break;
default:
strncpy(str, "Unknown AF", ai_addrlen);
}
return str;
} /* tac_ntop */
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